Three-phase electrode power measuring method of submerged arc furnace

Abstract

The invention provides a three-phase electrode power measuring method of a submerged arc furnace. A hardware circuit of the method comprises a voltage transformer, a current transformer, a power supply central point circuit, a primary voltage transmitter, a primary current transmitter, a primary active power transmitter, a molten pool central point circuit, a molten pool voltage transmitter, an analog quantity input module, a programmable controller PLC and an industrial control computer. In the invention, a central point of a three-phase electric furnace transformer is obtained through constructing the power supply central point circuit, a molten pool central point of the submerged arc furnace is obtained through constructing the molten pool central point circuit, each transmitter converts acquired voltage, current and power signals into standard current signals and sends the signals to the analog quantity input module of the programmable controller PLC, a PLC host sends the above data to the industrial control computer through an industrial ethernet (or an MPI), and the industrial control computer obtains active power of each electrode according to a three-phase electrode power model. According to the method, effective measurement and balanced control of three-phase electrode power of the three-phase transformer power supply submerged arc furnace are realized, a status of the furnace is stabilized, and power consumption is reduced.

Description

technical field [0001] The invention relates to a three-phase electrode power measurement method. Background technique [0002] The submerged arc furnace is the main equipment for smelting ferroalloy. It inputs electric energy into the furnace through electrodes. In the process of ferroalloy smelting in submerged arc furnaces, power supply control is an important condition to maintain stable furnace conditions and ensure normal smelting. Its purpose is to maintain the power balance of the three-phase molten pool by changing the secondary voltage level of the electric furnace transformer and the lifting electrodes under the condition that the capacity of the electric furnace power supply transformer is allowed, and to maximize the active power input into the furnace to improve the electrical efficiency and thermal efficiency. . Currently, the directly regulated supply parameters are electrode current, electrode impedance or molten pool power. Due to the existence of interf...

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Problems solved by technology

[0004] In order to solve the problem that the three-phase electrode power of the submerged arc furnace powered by the three-phase transformer is unmeasurable and it is difficult to realize the effective power balance control of the furnace, the invention provides a method for measuring the three-phase electrode power of the submerged arc furnace

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